There is a small cosmetic bug when using the ATF %gain% field. It displays a value of +%.2f dB which you might not think is wrong until you compare it with the values stored in tags. Then you notice that it is the factor and not the gain. I.e. -6dB results in +0.50 dB printed, 0dB in +1.00 dB and +6dB in +2.00 dB.

If the expected behaviour is to print the factor then the + and the <space>dB should be removed from what it prints. If it is not then change it to the gain that is applied (track, album, value for none).

[EDIT] Oh, the ATF help here should also be clarified depending on what is done.